Monitoring delamination of plasma-sprayed thermal barrier coatings by reflectance-enhanced luminescence

Plasma-sprayed thermal barrier coatings (TBCs) present a challenge for optical diagnostic methods to monitor TBC delamination, because the strong scattering exhibited by plasma-sprayed TBCs severely attenuates light transmitted through the TBC. This paper presents a new approach that indicates delam...

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Veröffentlicht in:Surface & coatings technology 2006-12, Vol.201 (7), p.3926-3930
Hauptverfasser: Eldridge, Jeffrey I., Bencic, Timothy J.
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Bencic, Timothy J.
description Plasma-sprayed thermal barrier coatings (TBCs) present a challenge for optical diagnostic methods to monitor TBC delamination, because the strong scattering exhibited by plasma-sprayed TBCs severely attenuates light transmitted through the TBC. This paper presents a new approach that indicates delamination in plasma-sprayed TBCs by utilizing a luminescent sublayer that produces significantly greater luminescence intensity from delaminated regions of the TBC. Freestanding coatings were produced with either a Eu-doped or Er-doped yttria-stabilized zirconia (YSZ) luminescent layer below a plasma-sprayed undoped YSZ layer. A NiCr backing layer was added to represent an attached substrate in some sections. For specimens with a Eu-doped YSZ luminescent sublayer, luminescence intensity maps showed excellent contrast between unbacked and NiCr-backed sections. Discernable contrast between unbacked and NiCr-backed sections was not observed for specimens with a Er-doped YSZ luminescent sublayer, because luminescence from Er impurities in the undoped YSZ layer overwhelmed luminescence originating from the Er-doped YSZ sublayer.
doi_str_mv 10.1016/j.surfcoat.2006.08.008
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source Elsevier ScienceDirect Journals
subjects Applied sciences
Exact sciences and technology
Luminescence
Metals. Metallurgy
Nondestructive evaluation
Nonmetallic coatings
Plasma-spray
Production techniques
Surface treatment
Thermal barrier coatings
title Monitoring delamination of plasma-sprayed thermal barrier coatings by reflectance-enhanced luminescence
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